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Differences in Knee and Hip Adduction and Hip Muscle Activation in Runners With and Without Iliotibial Band Syndrome.
PM R. 2018 10; 10(10):1032-1039.PM R

Abstract

BACKGROUND

Iliotibial band syndrome has been associated with altered hip and knee kinematics in runners. Previous studies have recommended further research on neuromuscular factors at the hip. The frontal plane hip muscles have been a strong focus in strength comparison but not for electromyography investigation.

OBJECTIVE

To compare hip surface electromyography, and frontal plane hip and knee kinematics, in runners with and without iliotibial band syndrome.

DESIGN

Observational cross-sectional study.

SETTING

Biomechanics research laboratory within a university.

PARTICIPANTS

Thirty subjects were recruited consisting of 15 injured runners with iliotibial band syndrome and 15 gender-, age-, and body mass index-matched controls. In each group, 8 were male runners and 7 were female runners. Inclusion criteria for the injured group were pain within 2 months related to iliotibial band syndrome and a positive Noble compression test. Participants were excluded if they reported other lower extremity diagnoses within the last year or active lower extremity or low back pain not related to iliotibial band syndrome. Controls were excluded if they reported a history of iliotibial band syndrome. Convenience sampling was used based on referrals from local running clinics and orthopedic clinics.

METHODS

Three-dimensional motion capture was performed with 10 high-speed cameras synchronized with wireless surface electromyography during a 30-minute run. The first data point was at 3 minutes, using a constant speed of 2.74 meters per second. A second data point was at 30 minutes, using a self-selected pace by the participant to allow for a challenging run until completion at 30 minutes.

MAIN OUTCOME MEASUREMENTS

Motion capture was reported as peak kinematic values from heel strike to peak knee flexion for hip adduction and knee adduction. Surface electromyography was reported as a percentage of maximal voluntary contraction for the gluteus maximus, gluteus medius and tensor fascia latae muscles.

RESULTS

Injured runners demonstrated increased knee adduction compared with control runners at 30 minutes (P = .002, control = -1.48°, injured = 3.74°). Tensor fasciae latae muscle activation in injured runners was increased compared with control runners at 3 minutes (P = .017, control = 7% maximal voluntary isometric contraction, injured = 11% maximal voluntary isometric contraction).

CONCLUSION

The results of this study suggest that lateral knee pain in runners localized to the distal iliotibial band is associated with increased knee adduction at 30 minutes. Increased tensor fasciae latae muscle activation at 3 minutes is noted, but more investigation is needed to better understand the clinical meaning. These findings are consistent with but not conclusive evidence supporting the theory that neuromuscular factors of the hip muscles may contribute to increased knee adduction in runners with iliotibial band syndrome. We advise caution using these findings to support treatments intended to modify tensor fasciae latae activation, given the small differences of 4% in muscle activation. Increased knee adduction in runners at 30 minutes was over 5° and beyond the minimal detectable difference. Additional research is needed to confirm whether the degree of knee adduction changes earlier versus later in a run and whether fatigue is a clinically relevant factor.

LEVEL OF EVIDENCE

III.

Authors+Show Affiliations

Samuel Merritt University, Motion Analysis Research Center, Oakland, CA; and Department of Sports and Orthopedic Physical Therapy, Emeryville Sports Physical, 2322 Powell Street, Oakland, CA 94609.Department of Physical Therapy, University of California San Francisco, School of Medicine, San Francisco, CA.School of Exercise and Nutritional Sciences, Doctor of Physical Therapy Program, San Diego State University, San Diego, CA.Division of Physical Medicine and Rehabilitation, Stanford University School of Medicine, Stanford, CA.School of Exercise and Nutritional Sciences, Doctor of Physical Therapy Program, San Diego State University, San Diego, CA.

Pub Type(s)

Journal Article
Observational Study

Language

eng

PubMed ID

29705166

Citation

Baker, Robert L., et al. "Differences in Knee and Hip Adduction and Hip Muscle Activation in Runners With and Without Iliotibial Band Syndrome." PM & R : the Journal of Injury, Function, and Rehabilitation, vol. 10, no. 10, 2018, pp. 1032-1039.
Baker RL, Souza RB, Rauh MJ, et al. Differences in Knee and Hip Adduction and Hip Muscle Activation in Runners With and Without Iliotibial Band Syndrome. PM R. 2018;10(10):1032-1039.
Baker, R. L., Souza, R. B., Rauh, M. J., Fredericson, M., & Rosenthal, M. D. (2018). Differences in Knee and Hip Adduction and Hip Muscle Activation in Runners With and Without Iliotibial Band Syndrome. PM & R : the Journal of Injury, Function, and Rehabilitation, 10(10), 1032-1039. https://doi.org/10.1016/j.pmrj.2018.04.004
Baker RL, et al. Differences in Knee and Hip Adduction and Hip Muscle Activation in Runners With and Without Iliotibial Band Syndrome. PM R. 2018;10(10):1032-1039. PubMed PMID: 29705166.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differences in Knee and Hip Adduction and Hip Muscle Activation in Runners With and Without Iliotibial Band Syndrome. AU - Baker,Robert L, AU - Souza,Richard B, AU - Rauh,Mitchell J, AU - Fredericson,Michael, AU - Rosenthal,Michael D, Y1 - 2018/04/26/ PY - 2017/10/18/received PY - 2018/04/09/revised PY - 2018/04/14/accepted PY - 2018/5/1/pubmed PY - 2019/10/11/medline PY - 2018/4/30/entrez SP - 1032 EP - 1039 JF - PM & R : the journal of injury, function, and rehabilitation JO - PM R VL - 10 IS - 10 N2 - BACKGROUND: Iliotibial band syndrome has been associated with altered hip and knee kinematics in runners. Previous studies have recommended further research on neuromuscular factors at the hip. The frontal plane hip muscles have been a strong focus in strength comparison but not for electromyography investigation. OBJECTIVE: To compare hip surface electromyography, and frontal plane hip and knee kinematics, in runners with and without iliotibial band syndrome. DESIGN: Observational cross-sectional study. SETTING: Biomechanics research laboratory within a university. PARTICIPANTS: Thirty subjects were recruited consisting of 15 injured runners with iliotibial band syndrome and 15 gender-, age-, and body mass index-matched controls. In each group, 8 were male runners and 7 were female runners. Inclusion criteria for the injured group were pain within 2 months related to iliotibial band syndrome and a positive Noble compression test. Participants were excluded if they reported other lower extremity diagnoses within the last year or active lower extremity or low back pain not related to iliotibial band syndrome. Controls were excluded if they reported a history of iliotibial band syndrome. Convenience sampling was used based on referrals from local running clinics and orthopedic clinics. METHODS: Three-dimensional motion capture was performed with 10 high-speed cameras synchronized with wireless surface electromyography during a 30-minute run. The first data point was at 3 minutes, using a constant speed of 2.74 meters per second. A second data point was at 30 minutes, using a self-selected pace by the participant to allow for a challenging run until completion at 30 minutes. MAIN OUTCOME MEASUREMENTS: Motion capture was reported as peak kinematic values from heel strike to peak knee flexion for hip adduction and knee adduction. Surface electromyography was reported as a percentage of maximal voluntary contraction for the gluteus maximus, gluteus medius and tensor fascia latae muscles. RESULTS: Injured runners demonstrated increased knee adduction compared with control runners at 30 minutes (P = .002, control = -1.48°, injured = 3.74°). Tensor fasciae latae muscle activation in injured runners was increased compared with control runners at 3 minutes (P = .017, control = 7% maximal voluntary isometric contraction, injured = 11% maximal voluntary isometric contraction). CONCLUSION: The results of this study suggest that lateral knee pain in runners localized to the distal iliotibial band is associated with increased knee adduction at 30 minutes. Increased tensor fasciae latae muscle activation at 3 minutes is noted, but more investigation is needed to better understand the clinical meaning. These findings are consistent with but not conclusive evidence supporting the theory that neuromuscular factors of the hip muscles may contribute to increased knee adduction in runners with iliotibial band syndrome. We advise caution using these findings to support treatments intended to modify tensor fasciae latae activation, given the small differences of 4% in muscle activation. Increased knee adduction in runners at 30 minutes was over 5° and beyond the minimal detectable difference. Additional research is needed to confirm whether the degree of knee adduction changes earlier versus later in a run and whether fatigue is a clinically relevant factor. LEVEL OF EVIDENCE: III. SN - 1934-1563 UR - https://www.unboundmedicine.com/medline/citation/29705166/Differences_in_Knee_and_Hip_Adduction_and_Hip_Muscle_Activation_in_Runners_With_and_Without_Iliotibial_Band_Syndrome_ L2 - https://doi.org/10.1016/j.pmrj.2018.04.004 DB - PRIME DP - Unbound Medicine ER -